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Magnetism and Matter — JEE Previous Year Questions

Every Magnetism and Matter question asked in JEE Main and JEE Advanced across the last 186 papers — 55 questions, each with its correct answer. Free to read, no account needed.

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55

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50/186

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27%

All 55 Magnetism and Matter questions

Most recent papers first.

Q1·PhysicsNumericalJEE Main 2026
Two identical small bar magnets each of dipole moment 353\sqrt{5}35​ J/T are placed at a center to center separation of 10 cm, with their axes perpendicular to each other as shown in figure. The value of magnetic field at the point P midway between the magnets is α × 10−310^{-3}10−3 T. The value of α is ______. (μ0=4π×10−7\mu_{0} = 4\pi \times 10^{-7}μ0​=4π×10−7 Tm/A)

Correct answer: 12

Step-by-step solution →
Q2·PhysicsSingle correctJEE Main 2026
A solenoid has a core made of material with relative permeability 400. The magnetic field produced in the interior of solenoid is 1.0 T. The magnetic intensity in SI units is α × 10510^{5}105. The value of α is ______. (Free space permeability μ0=4π×10−7\mu_{0} = 4\pi \times 10^{-7}μ0​=4π×10−7 SI units.)
  1. (A)25π\frac{25}{\pi}π25​
  2. (B)116π\frac{1}{16\pi}16π1​
  3. (C)1π\frac{1}{\pi}π1​
  4. (D)14π\frac{1}{4\pi}4π1​

Correct answer: (B)

Step-by-step solution →
Q3·PhysicsNumericalJEE Main 2026
A short bar magnet placed with its axis at 30° with an external field of 800 Gauss, experiences a torque of 0.016 N.m. The work done in moving it from most stable to most unstable position is α×10−3\alpha \times 10^{-3}α×10−3 J. The value of α\alphaα is ________.

Correct answer: 64

Step-by-step solution →
Q4·PhysicsSingle correctJEE Main 2026
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Consider a ferromagnetic material : Assertion (A) : The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains. Reason (R) : At high enough temperature, the domain structure of ferromagnetic material disintegrates. Thus, magnetization will disappear at high enough temperature known as Curie temperature. In the light of the above statements, choose the correct answer from the options given below :
  1. (A)(A) is true but (R) is false
  2. (B)Both (A) and (R) are true but (R) is not the correct explanation of (A)
  3. (C)Both (A) and (R) are true and (R) is the correct explanation of (A)
  4. (D)(A) is false but (R) is true

Correct answer: (B)

Step-by-step solution →
Q5·PhysicsSingle correctJEE Main 2025
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Magnetic monopoles do not exist. Reason (R): Magnetic field lines are continuous and form closed loops. In the light of the above statements, choose the most appropriate answer from the options given below:
  1. (A)Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  2. (B)(A) is correct but (R) is not correct
  3. (C)Both (A) and (R) are correct and (R) is the correct explanation of (A)
  4. (D)(A) is not correct but (R) is correct

Correct answer: (C)

Step-by-step solution →
Q6·PhysicsSingle correctJEE Main 2025
A magnetic dipole experiences a torque of 80380\sqrt3803​ N m when placed in a uniform magnetic field in such a way that the dipole moment makes an angle of 60∘60^\circ60∘ with the magnetic field. The potential energy of the dipole is:
  1. (A)80 J
  2. (B)−403-40\sqrt3−403​ J
  3. (C)−60-60−60 J
  4. (D)−80-80−80 J

Correct answer: (D)

Step-by-step solution →
Q7·PhysicsSingle correctJEE Main 2025
The relationship between the magnetic susceptibility (χ\chiχ) and the magnetic permeability (μ\muμ) is given by: (μ0\mu_0μ0​ is the permeability of free space and μr\mu_rμr​ is relative permeability)
  1. (A)χ=μμ0−1\chi=\dfrac{\mu}{\mu_0}-1χ=μ0​μ​−1
  2. (B)χ=μrμ0+1\chi=\dfrac{\mu_r}{\mu_0}+1χ=μ0​μr​​+1
  3. (C)χ=μr+1\chi=\mu_r+1χ=μr​+1
  4. (D)χ=1−μμ0\chi=1-\dfrac{\mu}{\mu_0}χ=1−μ0​μ​

Correct answer: (A)

Step-by-step solution →
Q8·PhysicsNumericalJEE Main 2024
A straight magnetic strip has a magnetic moment of 44 A m2^{2}2. If the strip is bent in a semicircular shape, its magnetic moment will be _______ A m2^{2}2. (Given π=227\pi=\dfrac{22}{7}π=722​)

Correct answer: 28

Step-by-step solution →
Q9·PhysicsSingle correctJEE Main 2024
Paramagnetic substances: A. align themselves along the directions of external magnetic field. B. attract strongly towards external magnetic field. C. has susceptibility little more than zero. D. move from a region of strong magnetic field to weak magnetic field. Choose the most appropriate answer from the options given below:
  1. (A)A, B, C, D
  2. (B)B, D Only
  3. (C)A, B, C Only
  4. (D)A, C Only

Correct answer: (D)

Step-by-step solution →
Q10·PhysicsNumericalJEE Main 2024
The coercivity of a magnet is 5×1035\times10^35×103 A/m. The amount of current required to be passed in a solenoid of length 30 cm and the number of turns 150, so that the magnet gets demagnetised when inside the solenoid is ________ A.

Correct answer: 10

Step-by-step solution →
Q11·PhysicsSingle correctJEE Main 2024
Match List-I (a quantity Y plotted against a quantity X in magnetism) with List-II (the shape of the corresponding graph). Choose the correct answer:
List-I (Y vs X)List-II (Shape of Graph)
A.Y = magnetic susceptibility, X = magnetising fieldI.see figure
B.Y = magnetic field, X = distance from centre of a current carrying wire for x < a (where a = radius of wire)II.see figure
C.Y = magnetic field, X = distance from centre of a current carrying wire for x > a (where a = radius of wire)III.see figure
D.Y = magnetic field inside solenoid, X = distance from centerIV.see figure
  1. (A)(A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  2. (B)(A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  3. (C)(A)-(IV), (B)-(I), (C)-(III), (D)-(II)
  4. (D)(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

Correct answer: (D)

Step-by-step solution →
Q12·PhysicsSingle correctJEE Main 2024
The magnetic moment of a bar magnet is 0.5 Am20.5\ \text{Am}^20.5 Am2. It is suspended in a uniform magnetic field of 8×10−28\times10^{-2}8×10−2 T. The work done in rotating it from its most stable to most unstable position is
  1. (A)2×10−22\times10^{-2}2×10−2 J
  2. (B)8×10−28\times10^{-2}8×10−2 J
  3. (C)4×10−24\times10^{-2}4×10−2 J
  4. (D)Zero

Correct answer: (B)

Step-by-step solution →
Q13·PhysicsNumericalJEE Main 2024
The horizontal component of earth’s magnetic field at a place is 3.5×10−5 T3.5\times10^{-5}\,T3.5×10−5T. A very long straight conductor carrying current of 2 A\sqrt2\,A2​A in the direction from South east to North West is placed. The force per unit length experienced by the conductor is ___ ×10−6 N/m\times10^{-6}\,N/m×10−6N/m.

Correct answer: 35

Step-by-step solution →
Q14·PhysicsNumericalJEE Main 2024
The magnetic potential due to a magnetic dipole at a point on its axis situated at a distance of 20 cm from its center is 1.5×10−51.5\times10^{-5}1.5×10−5 Tm. The magnetic moment of the dipole is ______ Am2^22. (Given : μ04π=10−7\dfrac{\mu_0}{4\pi}=10^{-7}4πμ0​​=10−7 TmA−1^{-1}−1)

Correct answer: 6

Step-by-step solution →
Q15·PhysicsSingle correctJEE Main 2023
Given below are two statements: Statement I: The diamagnetic property depends on temperature. Statement II: The induced magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field. In the light of given statement, choose the correct answer from the options given below:
  1. (A)Statement I is incorrect but Statement II is true
  2. (B)Both Statement I and Statement II are true.
  3. (C)Both Statement I and Statement II are false.
  4. (D)Statement I is correct but Statement II is false.

Correct answer: (A)

Step-by-step solution →
Q16·PhysicsNumericalJEE Main 2023
A compass needle oscillates 20 times per minute at a place where the dip is 30° and 30 times per minute where the dip is 60°. The ratio of total magnetic field due to the earth at the two places respectively is 4x\dfrac{4}{\sqrt{x}}x​4​. The value of x is _________.

Correct answer: 243

Step-by-step solution →
Q17·PhysicsSingle correctJEE Main 2023
The free space inside a current carrying toroid is filled with a material of susceptibility 2×10−22 \times 10^{-2}2×10−2. The percentage increase in the value of magnetic field inside the toroid will be
  1. (A)2%
  2. (B)0.2%
  3. (C)0.1%
  4. (D)1%

Correct answer: (A)

Step-by-step solution →
Q18·PhysicsSingle correctJEE Main 2023
Given below are two statements: Statement I: For a diamagnetic substance −1≤χ<0-1\le\chi<0−1≤χ<0, where χ\chiχ is the magnetic susceptibility. Statement II: Diamagnetic substances, when placed in an external magnetic field, tend to move from the stronger to the weaker part of the field. In the light of the above statements, choose the correct answer from the options given below:
  1. (A)Both Statement I and Statement II are false
  2. (B)Both Statement I and Statement II are true
  3. (C)Statement I is incorrect but Statement II is true
  4. (D)Statement I is correct but Statement II is false

Correct answer: (B)

Step-by-step solution →
Q19·PhysicsNumericalJEE Main 2023
The current required to be passed through a solenoid of 15 cm length and 60 turns in order to demagnetise a bar magnet of magnetic intensity 2.4×1032.4\times10^32.4×103 Am−1^{-1}−1 is _________ A.

Correct answer: 6

Step-by-step solution →
Q20·PhysicsNumericalJEE Main 2023
The magnetic intensity at the centre of a long current carrying solenoid is found to be 1.6×103 Am−11.6\times10^{3}\,\text{Am}^{-1}1.6×103Am−1. If the number of turns is 8 per cm, then the current flowing through the solenoid is ______ A\text{A}A.

Correct answer: 2

Step-by-step solution →
Q21·PhysicsSingle correctJEE Main 2023
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Electromagnets are made of soft iron. Reason R: Soft iron has high permeability and low retentivity. In the light of the above statements, choose the most appropriate answer from the options given below.
  1. (A)A is false but R is true
  2. (B)Both A and R are true and R is the correct explanation of A
  3. (C)Both A and R are true but R is NOT the correct explanation of A
  4. (D)A is true but R is false

Correct answer: (B)

Step-by-step solution →
Q22·PhysicsSingle correctJEE Main 2023
A rod with circular cross-section area 2 cm22\,\text{cm}^22cm2 and length 404040 cm is wound uniformly with 400400400 turns of an insulated wire. If a current of 0.40.40.4 A flows in the wire windings, the total magnetic flux produced inside windings is 4π×10−64\pi \times 10^{-6}4π×10−6 Wb. The relative permeability of the rod is (Given: Permeability of vacuum μ0=4π×10−7 NA−2\mu_0 = 4\pi \times 10^{-7}\,\text{NA}^{-2}μ0​=4π×10−7NA−2)
  1. (A)516\frac{5}{16}165​
  2. (B)12.512.512.5
  3. (C)125125125
  4. (D)325\frac{32}{5}532​

Correct answer: (A)

Step-by-step solution →
Q23·PhysicsSingle correctJEE Main 2023
A bar magnet with a magnetic moment 5.0 Am25.0\,\text{Am}^25.0Am2 is placed in parallel position relative to a magnetic field of 0.40.40.4 T. The amount of required work done in turning the magnet from parallel to antiparallel position relative to the field direction is __________.
  1. (A)111 J
  2. (B)444 J
  3. (C)222 J
  4. (D)zero

Correct answer: (B)

Step-by-step solution →
Q24·PhysicsSingle correctJEE Main 2022
The vertical component of the earth's magnetic field is 6×10−56 \times 10^{-5}6×10−5 T at any place where the angle of dip is 37º. The earth's resultant magnetic field at that place will be (Given tan 37º =34= \frac{3}{4}=43​)
  1. (A)8×10−58 \times 10^{-5}8×10−5 T
  2. (B)6×10−56 \times 10^{-5}6×10−5 T
  3. (C)5×10−45 \times 10^{-4}5×10−4 T
  4. (D)1×10−41 \times 10^{-4}1×10−4 T

Correct answer: (D)

Step-by-step solution →
Q25·PhysicsSingle correctJEE Main 2022
A compass needle of oscillation magnetometer oscillates 20 times per minute at a place P of dip 30°. The number of oscillations per minute become 10 at another place Q of 60° dip. The ratio of the total magnetic field at the two places (BQB_QBQ​ : BPB_PBP​) is:
  1. (A)3:4\sqrt{3} : 43​:4
  2. (B)4:34 : \sqrt{3}4:3​
  3. (C)3:2\sqrt{3} : 23​:2
  4. (D)2:32 : \sqrt{3}2:3​

Correct answer: (A)

Step-by-step solution →
Q26·PhysicsSingle correctJEE Main 2022
A magnet hung at 45º with magnetic meridian makes an angle of 60º with the horizontal. The actual value of the angle of dip is
  1. (A)tan⁡−1(32)\tan^{-1}\left(\sqrt{\dfrac{3}{2}}\right)tan−1(23​​)
  2. (B)tan⁡−1(6)\tan^{-1}\left(\sqrt{6}\right)tan−1(6​)
  3. (C)tan⁡−1(23)\tan^{-1}\left(\sqrt{\dfrac{2}{3}}\right)tan−1(32​​)
  4. (D)tan⁡−1(12)\tan^{-1}\left(\sqrt{\dfrac{1}{2}}\right)tan−1(21​​)

Correct answer: (A)

Step-by-step solution →
Q27·PhysicsSingle correctJEE Main 2022
Two bar magnets oscillate in a horizontal plane in earth’s magnetic field with time periods of 3 s and 4 s respectively. If their moments of inertia are in the ratio of 3 : 2 then the ratio of their magnetic moments will e :
  1. (A)2 : 1
  2. (B)8 : 3
  3. (C)1 : 3
  4. (D)27 : 16

Correct answer: (B)

Step-by-step solution →
Q28·PhysicsSingle correctJEE Main 2022
The magnetic moment of an electron (e) revolving in an orbit around nucleus with an orbital angular momentum is given by :
  1. (A)μ⃗L=eL⃗2m\vec{\mu}_L = \frac{e\vec{L}}{2m}μ​L​=2meL​
  2. (B)μ⃗L=−eL⃗2m\vec{\mu}_L = -\frac{e\vec{L}}{2m}μ​L​=−2meL​
  3. (C)μ⃗l=−eL⃗m\vec{\mu}_l = -\frac{e\vec{L}}{m}μ​l​=−meL​
  4. (D)μ⃗l=2eL⃗m\vec{\mu}_l = \frac{2e\vec{L}}{m}μ​l​=m2eL​

Correct answer: (B)

Step-by-step solution →
Q29·PhysicsSingle correctJEE Main 2022
At a certain place the angle of dip is 30° and the horizontal component of earth's magnetic field is 0.5 G. The earth's total magnetic field (in G), at that certain place, is :
  1. (A)13\frac{1}{\sqrt{3}}3​1​
  2. (B)12\frac{1}{2}21​
  3. (C)3\sqrt{3}3​
  4. (D)1

Correct answer: (A)

Step-by-step solution →
Q30·PhysicsSingle correctJEE Main 2022
The space inside a straight current carrying solenoid is filled with a magnetic material having magnetic susceptibility equal to 1.2×10−51.2\times10^{-5}1.2×10−5. What is fractional increase in the magnetic field inside solenoid with respect to air as medium inside the solenoid?
  1. (A)1.2×10−51.2\times10^{-5}1.2×10−5
  2. (B)1.2×10−31.2\times10^{-3}1.2×10−3
  3. (C)1.8×10−31.8\times10^{-3}1.8×10−3
  4. (D)2.4×10−52.4\times10^{-5}2.4×10−5

Correct answer: (A)

Step-by-step solution →
Q31·PhysicsSingle correctJEE Main 2022
The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A-m is : [Permeability of free space μ0=4π×10−7 Wb/A−m\mu_{0} = 4\pi \times 10^{-7}\,Wb/A-mμ0​=4π×10−7Wb/A−m ]
  1. (A)4π×10−74\pi \times 10^{-7}4π×10−7
  2. (B)4π×10−44\pi \times 10^{-4}4π×10−4
  3. (C)4π×10−54\pi \times 10^{-5}4π×10−5
  4. (D)4π×10−64\pi \times 10^{-6}4π×10−6

Correct answer: (C)

Step-by-step solution →
Q32·PhysicsSingle correctJEE Main 2022
A bar magnet having a magnetic moment of 2.0×1052.0 \times 10^52.0×105 JT−1^{-1}−1, is placed along the direction of uniform magnetic field of magnitude B= 14×10−514 \times 10^{-5}14×10−5 T. The work done in rotating the magnet slowly through 60° from the direction of field is :
  1. (A)14 J
  2. (B)8.4 J
  3. (C)4 J
  4. (D)1.4 J

Correct answer: (A)

Step-by-step solution →
Q33·PhysicsSingle correctJEE Main 2022
Given below are two statements: Statement – I : Susceptibilities of paramagnetic and ferromagnetic substances increase with decrease in temperature. Statement – II: Diamagnetism is a result of orbital motions of electrons developing magnetic moments opposite to the applied magnetic field. Choose the CORRECT answer from the options given below : -
  1. (A)Both statement – I and statement -II are true.
  2. (B)Both statement – I and Statement – II are false.
  3. (C)Statement – I is true but statement – II is false.
  4. (D)Statement-I is false but Statement-II is true.

Correct answer: (A)

Step-by-step solution →
Q34·PhysicsSingle correctJEE Main 2022
The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has :
  1. (A)low coercively and high retentively
  2. (B)low coercively and low permeability
  3. (C)high permeability and low retentively
  4. (D)high permeability and high retentively

Correct answer: (C)

Step-by-step solution →
Q35·PhysicsSingle correctJEE Main 2021
Following plots show Magnetization (M) vs Magnetising field (H) and Magnetic susceptibility ( χ ) vs temperature (T) graph : Which of the following combination will be represented by a diamagnetic material?
  1. (A)(a), (c)
  2. (B)(a), (d)
  3. (C)(b), (d)
  4. (D)(b), (c)

Correct answer: (A)

Step-by-step solution →
Q36·PhysicsNumericalJEE Main 2021
A long solenoid with 1000 turns/m has a core material with relative permeability 500 and volume 103^{3}3 cm3^{3}3. If the core material is replaced by another material having relative permeability of 750 with same volume maintaining same current of 0.75 A in the solenoid, the fractional change in the magnetic moment of the core would be approximately (x499)\left(\frac{x}{499}\right)(499x​). Find the value of x.

Correct answer: 250

Step-by-step solution →
Q37·PhysicsNumericalJEE Main 2021
Two short magnetic dipoles m1m_1m1​ and m2m_2m2​ each having magnetic moment of 1 Am21\ \mathrm{Am^2}1 Am2 are placed at point O and P respectively. The distance between OP is 1 meter. The torque experienced by the magnetic dipole m2m_2m2​ due to the presence of m1m_1m1​ is ...... ×10−7\times 10^{-7}×10−7 Nm.

Correct answer: 1

Step-by-step solution →
Q38·PhysicsNumericalJEE Main 2021
In a uniform magnetic field, the magnetic needle has a magnetic moment 9.85×10−210^{-2}10−2 A / m² and moment of inertia 5×10−610^{-6}10−6 kg m².If it performs 10 complete oscillations in 5 seconds then the magnitude of the magnetic field is ____ mT. [ Take π2\pi^2π2 as 9.85 ]

Correct answer: 8

Step-by-step solution →
Q39·PhysicsNumericalJEE Main 2021
The value of aluminium susceptibility is 2.2×10−52.2 \times 10^{-5}2.2×10−5 . The percentage increase in the magnetic field if space within a current carrying toroid is filled with Aluminium is x104\frac{x}{10^4}104x​. Then the value of x is __________.

Correct answer: 22

Step-by-step solution →
Q40·PhysicsSingle correctJEE Main 2021
Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet. Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases. In the light of the above statements, choose the most appropriate answer from the options given below :
  1. (A)Both Statement I and Statement II are false
  2. (B)Statement I is true but Statement II is false
  3. (C)Statement I is false but Statement II is true
  4. (D)Both Statement I and Statement II are true

Correct answer: (B)

Step-by-step solution →
Q41·PhysicsSingle correctJEE Main 2021
At an angle of 30∘30^{\circ}30∘ to the magnetic meridian, the apparent dip is 45∘45^{\circ}45∘. Find the true dip:
  1. (A)tan⁡−132\tan^{-1}\frac{\sqrt{3}}{2}tan−123​​
  2. (B)tan⁡−13\tan^{-1}\sqrt{3}tan−13​
  3. (C)tan⁡−113\tan^{-1}\frac{1}{\sqrt{3}}tan−13​1​
  4. (D)tan⁡−123\tan^{-1}\frac{2}{\sqrt{3}}tan−13​2​

Correct answer: (A)

Step-by-step solution →
Q42·PhysicsSingle correctJEE Main 2021
The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4π×10−7 H/m4\pi \times 10^{-7}\ \mathrm{H/m}4π×10−7 H/m. Absolute permeability of the material of the rod is:
  1. (A)3π×10−4 H/m3\pi \times 10^{-4}\ \mathrm{H/m}3π×10−4 H/m
  2. (B)π×10−4 H/m\pi \times 10^{-4}\ \mathrm{H/m}π×10−4 H/m
  3. (C)2π×10−4 H/m2\pi \times 10^{-4}\ \mathrm{H/m}2π×10−4 H/m
  4. (D)4π×10−4 H/m4\pi \times 10^{-4}\ \mathrm{H/m}4π×10−4 H/m

Correct answer: (C)

Step-by-step solution →
Q43·PhysicsSingle correctJEE Main 2021
A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the center of the magnet. If BH_HH​ = 0.4 G, the magnetic moment of the magnet is (1 G = 10−4^{-4}−4T)
  1. (A)2.880 × 103^{3}3 J T−1^{-1}−1
  2. (B)2.880 × 102^{2}2 J T−1^{-1}−1
  3. (C)2.880 J T−1^{-1}−1
  4. (D)28.80 J T−1^{-1}−1

Correct answer: (C)

Step-by-step solution →
Q44·PhysicsSingle correctJEE Main 2021
In a ferromagnetic material, below the curie temperature, a domain is defined as:
  1. (A)a macroscopic region with consecutive magnetic diploes oriented in opposite direction.
  2. (B)a macroscopic region with zero magnetization.
  3. (C)a macroscopic region with saturation magnetization.
  4. (D)a macroscopic region with randomly oriented magnetic dipoles.

Correct answer: (C)

Step-by-step solution →
Q45·PhysicsSingle correctJEE Main 2021
A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains :
  1. (A)decrease in size and changes orientation.
  2. (B)may increase or decrease in size and change its orientation.
  3. (C)increase in size but no change in orientation.
  4. (D)have no relation with external magnetic field.

Correct answer: (B)

Step-by-step solution →
Q46·PhysicsSingle correctJEE Main 2020
An iron rod of volume 10−310^{-3}10−3 m3^33 and relative permeability 1000 is placed as core in a solenoid with 10 turns/cm. If a current of 0.5 A is passed through the solenoid, then the magnetic moment of the rod will be:
  1. (A)0.5×1020.5 \times 10^{2}0.5×102 Am2^22
  2. (B)50×10250 \times 10^{2}50×102 Am2^22
  3. (C)500×102500 \times 10^{2}500×102 Am2^22
  4. (D)5×1025 \times 10^{2}5×102 Am2^22

Correct answer: (D)

Step-by-step solution →
Q47·PhysicsSingle correctJEE Main 2020
A small bar magnet placed with its axis at 30° with an external field of 0.06 T experiences a torque of 0.018 Nm. The minimum work required to rotate it from its stable to unstable equilibrium position is:
  1. (A)11.7×10−311.7 \times 10^{-3}11.7×10−3 J
  2. (B)9.2×10−39.2 \times 10^{-3}9.2×10−3 J
  3. (C)7.2×10−27.2 \times 10^{-2}7.2×10−2 J
  4. (D)6.4×10−26.4 \times 10^{-2}6.4×10−2 J

Correct answer: (C)

Step-by-step solution →
Q48·PhysicsSingle correctJEE Main 2020
A paramagnetic sample shows a net magnetisation of 6A/m when it is placed in an external magnetic field of 0.4 T at a temperature of 4K. When the sample is placed in an external magnetic field of 0.3T at a temperature of 24K, then the magnetisation will be :
  1. (A)1 A/m
  2. (B)0.75 A/m
  3. (C)2.25 A/m
  4. (D)4 A/m

Correct answer: (B)

Step-by-step solution →
Q49·PhysicsSingle correctJEE Main 2020
A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field B⃗\vec{B}B. Then the field inside the paramagnetic substance is:
  1. (A)zero
  2. (B)much large than ∣B⃗∣\left|\vec{B}\right|​B​ but opposite to B⃗\vec{B}B
  3. (C)B⃗\vec{B}B
  4. (D)much large than ∣B⃗∣\left|\vec{B}\right|​B​ and parallel to B⃗\vec{B}B

Correct answer: (A)

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Q50·PhysicsSingle correctJEE Main 2020
A small circular loop of conducting wire has radius a and carries current I. It is placed in a uniform magnetic field B perpendicular to its plane such that when rotated slightly about its diameter and released, it starts performing simple harmonic motion of time period T. If the mass of the loop is m then:
  1. (A)T=πmIBT=\sqrt{\frac{\pi m}{IB}}T=IBπm​​
  2. (B)T=πm2IBT=\sqrt{\frac{\pi m}{2IB}}T=2IBπm​​
  3. (C)T=2πmIBT=\sqrt{\frac{2\pi m}{IB}}T=IB2πm​​
  4. (D)T=2mIBT=\sqrt{\frac{2m}{IB}}T=IB2m​​

Correct answer: (C)

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Q51·PhysicsSingle correctJEE Main 2020
The figure gives experimentally measured B vs H variation in a ferromagnetic material. The retentivity, co-ercivity and saturation, respectively, of the material are
  1. (A)1.0 T, 50 A/m and 1.5 T
  2. (B)1.5 T, 50 A/m and 1.0 T
  3. (C)150 A/m, 1.0 T and 1.5 T
  4. (D)1.5 T, 50 A/m and 1.0 T

Correct answer: (A)

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Q52·PhysicsSingle correctJEE Main 2019
A magnetic compass needle oscillates 30 times per minute at a place where the dip is 45°, and 40 times per minute where the dip is 30º. If B1B_1B1​ and B2B_2B2​ are respectively the total magnetic field due to the earth at the two places, then the ratio B1/B2B_1/B_2B1​/B2​ is best given by :
  1. (A)3.6
  2. (B)1.8
  3. (C)2.2
  4. (D)0.7

Correct answer: (D)

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Q53·PhysicsSingle correctJEE Main 2019
Two magnetic dipoles X and Y are placed at a separation d, with their axes perpendicular to each other. The dipole moment of Y is twice that of X. A particle of charge q is passing through their mid-point P, at angle θ=450\theta = 45^{0}θ=450 with the horizontal line as shown in the figure. What would be the magnitude of force on the particle at that instant? (d is much larger than the dimensions of the dipole)
  1. (A)(μ04π)M(d/2)3×qv\left(\frac{\mu_0}{4\pi}\right)\frac{M}{(d/2)^3} \times qv(4πμ0​​)(d/2)3M​×qv
  2. (B)0
  3. (C)(μ04π)2M(d/2)3×qv\left(\frac{\mu_0}{4\pi}\right)\frac{2M}{(d/2)^3} \times qv(4πμ0​​)(d/2)32M​×qv
  4. (D)2(μ04π)M(d/2)3×qv\sqrt{2}\left(\frac{\mu_0}{4\pi}\right)\frac{M}{(d/2)^3} \times qv2​(4πμ0​​)(d/2)3M​×qv

Correct answer: (B)

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Q54·PhysicsSingle correctJEE Main 2019
A paramagnetic material has 102810^{28}1028 atoms/m3^{3}3. Its magnetic susceptibility at temperature 350 K is 2.8×10−42.8 \times 10^{-4}2.8×10−4. Its susceptibility at 300 K is :
  1. (A)3.267×10−43.267 \times 10^{-4}3.267×10−4
  2. (B)3.672×10−43.672 \times 10^{-4}3.672×10−4
  3. (C)3.726×10−43.726 \times 10^{-4}3.726×10−4
  4. (D)2.672×10−42.672 \times 10^{-4}2.672×10−4

Correct answer: (A)

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Q55·PhysicsSingle correctJEE Main 2019
A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is
  1. (A)285 A/m
  2. (B)2600 A/m
  3. (C)520 A/m
  4. (D)1200 A/m

Correct answer: (B)

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Magnetism and Matter — frequently asked

How many questions from Magnetism and Matter appear in JEE?

Magnetism and Matter has appeared in 50 of the last 186 JEE Main and JEE Advanced papers — about 27% of them — contributing 55 questions in total across those papers.

Is Magnetism and Matter an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 27% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these Magnetism and Matter questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

Other Physics chapters

  • Properties of Solids and Liquids 344
  • Current Electricity 309
  • Rotational Motion 266
  • Geometrical Optics 259
  • Kinematics 255
  • Magnetic Field of Current 211
  • Electromagnetic Waves 208
  • Thermodynamics 201

All 28 Physics chapters →

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